Description: Calor Gas Roadshow , Battersea park 1 / 8 / 2000 The Power for Tomorrows Cleaner Cities Today The Roadshow promoted by Calor Gas , demonstrates examples of all types of vehicles fuelled by clean LPG : a Bentley , a Morgan , a Vauxhall Vectra , London Black Cabs , a police car from the Hampshire Police and buses . There were also vans , lawnmowers , generators and other applications . The event was staged to provide fleet vehicle purchasers , local authorities , the construction industry and the general public with the opportunity to see how they can save money and protect the environment by switching to this clean and efficient fuel .